Disable BlockedPopupContainerView tests on Mac Valgrind

BUG=15818
TEST=None
TBR=pinkerton

Review URL: http://codereview.chromium.org/149196

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@19942 0039d316-1c4b-4281-b951-d872f2087c98

chrome/test/data/valgrind/unit_tests.gtest_mac.txt

 # Times out too often
 # crbug.com/15817
 IPCSyncChannelTest.*
+
+# Disable BlockedPopupContainerControllerTest.
+# Remove after crbug.com/15818 is fixed
+BlockedPopupContainerControllerTest.*